Ensure that every `io_uring_get_sqe` is used correctly.

[ioquatix]

It turns out, not every call to io_get_sqe was followed by a submission, causing corrupt entries in the submission queue.

Types of Changes

• Bug fix.

Contribution

• [ ] I added tests for my changes.
• [x] I tested my changes locally.
• [x] I agree to the Developer's Certificate of Origin 1.1.